Finding the Fourth Proportional to 82.29, 123.43 and 81.34

Step by Step Solution

1. Step 1: Write the proportion equation
   82.29 : 123.43 = 81.34 : x
2. Step 2: Convert to fraction form
   82.29/123.43 = 81.34/x
3. Step 3: Cross multiply
   82.29x = 123.43 × 81.34
4. Step 4: Simplify right side
   82.29x = 10,039.80
5. Step 5: Solve for x
   x = 10,039.80/82.29
6. Step 6: Final answer
   x = 122.01